Windows Live Sync vs. Live Mesh vs. SkyDrive, etc.: Which is Right for You?

I am very tempted to go with SpiderOak.  What do you think is the best storage, backup, sync service right now?

Windows Live Sync vs. Live Mesh vs. SkyDrive: Which is Right for You?

The Best Online Storage Service - Windows SkyDrive

SkyDrive or Google Docs?

Windows Life SkyDrive and 3 alternative storage services

Windows Skydrive vs Google Docs

Cloud Storage: On SugarSync, DropBox & Live Mesh

4 Free Alternatives to Dropbox

SpiderOak Vs. Dropbox